from another thread, involving the same issue:
"I was able to "clear" the parsing error by removing (i actually copied it to my computer in case you need it) the rockband.apk that is in the root of the filesystem when connected to computer. However - I have not yet re-downloaded the demo so the error may happen again.
Just to follow up, I re-opened and downloaded on wifi after deleting the rockband.apk and it successfully downloaded and runs now"
All you have to do is go into your file manager and delete the rockband.apk. Once that's done, you should be able to reinstall the app by clicking on it in the app drawer. Make sure your wi-fi is turned when reinstalling the app. I can't remember if I rebooted my phone after deleting the apk.